Guards say it's governed in a repressive way (6,5)
I believe the answer is:
police state
'governed in a repressive way' is the definition.
I can't tell whether this defines the answer.
'guards say' is the wordplay.
'guards' becomes 'polices' (policing is a kind of guarding).
'say' becomes 'tate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'polices'+'tate'='POLICE STATE'
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for police state that I've seen before include "Big Brother society" , "Regime monitoring citizens" , "East Germany once" , "Oceania perhaps" .)